A filter, which returns a non-null value only when the input number is withing the defined range.
Creates a filter, which yields a successful result when the input number >= min
Creates a filter, which yields a successful result when the input number <= max
Creates a filter, which yields a successful result when min<= input number <= max
Evaluates the filter with the given value.
Formats the current filter as a tree, and returns the formatted string.